What changes in breast sensitivity have you experienced along the way?
Here is my situation: 39, pre-everything, not overweight but with natural A-cups. (I was called "Mr. D Cup" in high school.) (I suspect some intersex condition but the docs haven't found anything definite yet. My therapist says I could easily pass for an FTM.

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My breasts are the most erogenous zone in my body. The skin is very sensitive all over, especially on the underside. The only exception is the aureola, which seems to have no sensation at all. My nipples on the other hand are extremely sensitive and send me skyrocketing. They are much more sensitive than that thing between my legs. When I walk at the right speed my twins bounce in a way that is sometimes pleasurable and sometimes really annoying.
Indeed, one of the many reasons I desire to transition (in addition to feeling like I really am a girl inside) is that since I love my small breasts, I will like bigger ones even more.
What happens to breast sensitivity along the transition path?
I have read that on HRT there are growing pains and the breasts become sore. Temporary growing pains would be fine with me. But what I actually fear is a loss of the erotic sensitivity. My wife has large breasts and she says that they are not erotic and she does not like to have them touched.
I know that one should not embark upon transition in the hopes of improving one's sex life. Indeed, one needs to be willing to lose it all due to loss of partner and bad surgical outcomes. But it would be really depressing if I lost the sensations of my most feminine (for now) parts.
What has been your experience with changes in breast sensitivity along the transition path? How does it change with HRT? What impact does SRS have? And what about the impact of breast augmentation?